Finding the Fourth Proportional to 2,528.30, 3,788.85 and 987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,528.30 : 3,788.85 = 987.50 : x
2. Step 2: Convert to fraction form
   2,528.30/3,788.85 = 987.50/x
3. Step 3: Cross multiply
   2,528.30x = 3,788.85 × 987.50
4. Step 4: Simplify right side
   2,528.30x = 3,741,489.38
5. Step 5: Solve for x
   x = 3,741,489.38/2,528.30
6. Step 6: Final answer
   x = 1,479.84